If you are developing programs which will use shared libraries, but do not usethe rest of the GNU Autotools (such as GNU Autoconf and GNU Automake), youshould install the libtool package.

The libtool package also includes all files needed to integrate the GNUPortable Library Tool (libtool) and the GNU Libtool Dynamic Module Loader(ltdl) into a package built using the GNU Autotools (including GNU Autoconfand GNU Automake).